Entity Framework 6 - Knowledge Base (KB)

The LINQ expression node type 'Invoke' is not supported in LINQ to Entities in entity framework

can anyone help me out in solving my issue. I am using the code given below:...public IEnumerable<InvoiceHeader> Getdata(Expression<Func<InvoiceHeader, bool>> predicate) { return AccountsContext.InvoiceHeaders.Include("Company").Include("Currency") ...

How to use a Func in an expression with Linq to Entity Framework?

I am trying to write a linq to entity extension method that takes a Func to select a property Id and compare it against a list of ids....Classes...public class A { public int AId { get; set; } } public class B { public int BId { get; set; } } ...

LINQ multiple join IQueryable modify result selector expression

Imagine the following table structure...--------- TableA ID Name --------- TableB ID TableAID --------- TableC ID TableBID ...I want to define a function that joins these three tables and accepts an ...Expression<Func<TableA, TableB, TableC, T>>... as a...

Expression of type 'System.Linq.Expressions.Expression cannot be used for parameter of type

I created dynamic select for Type...public static IQueryable<TResult> Select<TSource, TResult>(this IQueryable<TSource> source, TResult result) { var resultType = typeof(TResult); var resultObj = Expression.New(resultType); var receiverPropert...

Pass expression parameter as argument to another expression

I have a query which filters results:...public IEnumerable<FilteredViewModel> GetFilteredQuotes() { return _context.Context.Quotes.Select(q => new FilteredViewModel { Quote = q, QuoteProductImages = q.QuoteProducts.SelectMany(qp =>...

Moving C# function to expression for use in Entity Framework / SQL Select

I have some small C# functions and computed cols from views that I'd like to move to Expressions so that they execute directly against the datasource in native T/SQL....I can do this inline in the Select, but I'd like to move it to a common function for r...

Entity Framework combine lambda expressions from different entities

I have 2 lambda expressions that are virtually the same. One returns ...Expression<Func<Person, bool>>... and the other returns ...Expression<Func<Admission, bool>>.......There is a direct relationship between these 2 entities. A ...Person... can have man...

How to pass an Expression into Entity Framework LINQ query OrderBy clause

I have the following LINQ query:...using (var context = new EUContext()) { var tmp = context.Terms.Include(x => x.StudentCourses) .Where(x => x.StudentID == studentId && x.DepartmentID == departmentId) ....